The rop right, 3dot menu on a note should have a "remove from bookmarks" option. There is some sort of bug that prevents some long-form posts from being removed, but the option is still there initially.
In the top right corner it only appears to me download and share buttons. The post is an image.
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Back out one screen...
Luckily I could find the original note and remove it. Thank you.
Suggesting to include that button in the bookmarks list. Third party notes/thoots are not that easy to find.